Here's an eerie Tic Tac Toe trick to totally impress your friends. You play a game of Tic Tac Toe with a friend. The game ends in a draw. You pull out a piece of paper (or napkin) that you drew in advance that shows exactly what the ending board would look like. How did you know? Did you control their mind and force them to make the moves you wanted them to?
This great trick is attributed to the late Martin Gardner. It is a great one for kids to learn because it will teach them some things about logical thinking. Hat tip to @grey_matter2 for the trick.